Wanted to share my experience ...so when I called Alliant CU based on advice from Tesla team, the CU told me that simply buying from Tesla didn't qualify me for membership, and therefore no loan. Perhaps that is true or the member service rep I talked with was mis-informed. At any rate (no pun intended), my local credit union provided financing with just an email to my loan officer.
It's like $5 and they donate a puppy in your name to a children's blind school. But seriously, I think I signed up in 2014 and I had to deposit $10 and then they gave me a $10 credit towards some charity. Actually, they might have even did the donation and the deposit. Membership was very simple.